package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;
import java.util.Objects;

@Service
public class DishServiceImpl implements DishService {
    private final DishMapper dishMapper;
    private final DishFlavorMapper dishFlavorMapper;
    private final SetmealDishMapper setmealDishMapper;

    @Autowired
    public DishServiceImpl(DishMapper dishMapper, DishFlavorMapper dishFlavorMapper, SetmealDishMapper setmealDishMapper) {
        this.dishMapper = dishMapper;
        this.dishFlavorMapper = dishFlavorMapper;
        this.setmealDishMapper = setmealDishMapper;
    }


    @Override
    @Transactional
    //新增菜品和对应的口味数据
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        if (dishFlavors != null && !dishFlavors.isEmpty()) {
            dishFlavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(dishFlavors);
        }
    }

    //菜品分页查询
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    //批量删除菜品
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除（是否存在启售中的菜品）
        ids.forEach(id -> {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                //当前菜品处于启售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });
        //判断当前菜品是否能够删除（是否存在套餐关联）
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            //当前菜品被套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
        dishMapper.deleteById(ids);
        //删除菜品关联的口味数据
        dishFlavorMapper.deleteByDishId(ids);
    }

    //根据id查询菜品和对应的口味数据
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据ID查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品ID查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将数据封装到VO中并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    //修改菜品和对应的口味数据
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除菜品表中原有的口味数据
        dishFlavorMapper.deleteByDishId(Collections.singletonList(dishDTO.getId()));
        //重新插入口味数据
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        if (dishFlavors != null && !dishFlavors.isEmpty()) {
            dishFlavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(dishFlavors);
        }
    }

    //启售禁售菜品
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    //根据分类id查询菜品
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}
